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Find out why a stock is moving. The 7-day free trial adds AI briefings, catalysts and watchlists.
Big Movers & Unusual Volume
The latest US trading day's biggest biotech gainers, losers, and stocks with unusual volume, updated through the session. Click a stock to open its page.
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Why Track Big Movers?
Gainers Signal Catalysts
A 10%+ move in biotech almost always has a catalyst: FDA data, trial results, or a buyout rumor. Finding the "why" behind the move is key to deciding if it continues.
Losers Signal Risk
Big drops in biotech stocks often signal failed trials, FDA rejections, or dilutive offerings. Watch for oversold bounces but beware of catching falling knives.
Volume Precedes Price
When volume spikes 3-5x before a catalyst date, "smart money" is often positioning ahead of news. Volume anomalies are one of the strongest early signals in biotech.